Statutory guidance

Sub-offices of assay offices: policy paper

The sub-office is operated by assay office employees as an independent facility within a host company or at a separate location.


Sub-office policy paper

Sub-offices application form


The British Hallmarking Council (BHC) has the power to authorise an assay office to assay and mark items at locations other than their main address.

In 2001 and 2002 BHC adopted a new policy and procedure relating to the exercise of the power. They agreed a policy statement and an application form.

There are currently 9 sub-offices operating as follows:

  • Sheffield Assay Office: Carrs of Sheffield
  • Birmingham Assay Office: Curteis, Optima, Cookson Precious Metals, Argos, DOMINO, Hockley Mint
  • London Assay Office: Hatton Garden, Brinks Heathrow
Published 12 July 2013
Last updated 8 December 2015 + show all updates
  1. Amended sub-office application form.
  2. Family Jewels is no longer a sub-office of the Birmingham Assay Office, and has been removed from the list of sub-offices.
  3. added Providing better information and protection for consumers policy tag
  4. First published.